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7n+3=3n+227

We move all terms to the left:

7n+3-(3n+227)=0

We get rid of parentheses

7n-3n-227+3=0

We add all the numbers together, and all the variables

4n-224=0

We move all terms containing n to the left, all other terms to the right

4n=224

n=224/4

n=56

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